00256nam a2200109Ia 4500008004100000041001200041082001100053100001400064245005600078260000600134650000600140221030s9999    xx            000 0 und d  aEnglish  a105.23  aM. Hayden 0aTeach Yourself Networking in 24 Hourscby M. Hayden  c0  aB